如果使用iPhone（实际设备）的用户第一次登陆我的网站，“汉堡包菜单”根本无法打开菜单，导航栏将不会出现在滚动窗口中。它似乎在Android设备上工作得很好（除非我们要相信responsinator，否则可能是纵向模式下的Nexus 4）和Win桌面。
实际网站的后端是用Razor / ASP.NET制作的，但显然我认为这是一个纯粹的前端问题。
刷新后，它也开始在Apple设备（以及iPhone）上运行。然后有时会停止工作（一次或两次它再次停止工作，我相信）。
Head（尝试删除异步并推迟，不起作用）：
<script type="text/javascript" src="script.js" async defer></script>
这是HTML（使用带有徽标图像的h2标签的错误）：
<div id="navigation-main">
<h2 class="logo">
<a href="#">
<img src="images/white-logo.png" alt="">
</a>
</h2>
<div id="menu-icon">
<span class="icon-menu-hamburguer"></span>
</div>
<nav id="menu-main">
<ul>
<li><a class="scroll" href="#about-anchor">About us</a></li>
<li><a class="scroll" href="#agenda-anchor">Agenda</a></li>
<li><a class="scroll" href="#gallery-anchor">Gallery</a></li>
<li><a class="scroll" href="#sponsors-anchor">Sponsors</a></li>
<li><a class="scroll" href="#contact-anchor">Contact</a></li>
<li><a href="login.html">Log in <img src="images/login_icon.png" alt=""></a></li>
</ul>
</nav>
CSS：
#navigation-main {
min-height: 60px;
z-index: 9;
overflow: hidden;
-webkit-transition: all 0.5s linear;
-moz-transition: all 0.5s linear;
-ms-transition: all 0.5s linear;
-o-transition: all 0.5s linear;
transition: all 0.5s linear;
}
#navigation-main:active {
background-color: #000000;
}
#navigation-main .logo {
float: left;
}
#navigation-main .logo img {
display: none;
}
#navigation-main nav {
position: relative;
top: 20px;
}
#navigation-main nav ul {
margin: 0;
padding-left: 0;
}
#navigation-main nav ul li {
list-style: none
}
#navigation-main nav ul li a {
color: #FFFFFF;
text-decoration: none
}
#navigation-main #menu-icon {
display: none;
}
#navigation-main.active {
background-color: rgb(0, 0, 0);
position: fixed;
top: 0;
height: 60px;
width: 100%;
margin-bottom: 0;
-webkit-transition: all 0.5s linear;
-moz-transition: all 0.5s linear;
-ms-transition: all 0.5s linear;
-o-transition: all 0.5s linear;
transition: all 0.5s linear;
}
#navigation-main.active img {
display: inline-block;
}
#navigation-main.active #menu-icon {
top: 10px;
}
#navigation-main.active .logo img {
max-width: 50%;
}
#navigation-main.active nav li a {
color: #FFFFFF
}
#navigation-main nav ul li img {
vertical-align: middle;
}
@media (max-width: 768px) {
#navigation-main .logo img {
max-width: 80%
}
#navigation-main #menu-icon {
padding: 18px 12px;
margin: 2px 0;
position: relative;
top: 20px;
display: block;
float: right;
z-index: 10;
cursor: pointer;
}
#navigation-main #menu-icon .icon-menu-hamburguer {
background: #ff0000;
width: 30px;
height: 4px;
margin: 2px 0;
display: block;
}
#navigation-main #menu-icon .icon-menu-hamburguer:after,
#navigation-main #menu-icon .icon-menu-hamburguer:before {
content: '';
background: #ff0000;
width: 30px;
height: 4px;
display: block;
margin: 2px 0;
position: relative;
}
#navigation-main #menu-icon .icon-menu-hamburguer:before {
bottom: 8px;
}
#navigation-main #menu-icon .icon-menu-hamburguer:after {
top: 2px;
}
#navigation-main nav {
display: none;
width: 100%;
}
#navigation-main nav.menu-active {
display: block;
clear: both;
height: 100%;
position: fixed;
z-index: 1;
left: 0;
top: 0;
background-color: rgb(0, 0, 0);
background-color: rgba(0, 0, 0, 0.80);
overflow-x: hidden;
}
#navigation-main nav.menu-active ul {
position: relative;
top: 15%;
width: 100%;
text-align: center;
margin-top: 30px;
}
#navigation-main nav.menu-active a {
padding: 8px;
text-decoration: none;
font-size: 1.75rem;
display: block;
}
}
@media (min-width: 768px) {
#navigation-main nav {
float: right;
padding-right: 20px;
}
#navigation-main nav ul li,
#navigation-main nav ul li img {
display: inline-block;
}
#navigation-main nav ul li a {
padding: 0 5px;
font-size: 0.9rem;
}
}
使用Javascript：
(function() {
////////// Sticky navbar and hamburger icon
var headerScroll = getId('navigation-main'),
scrollHeight = 250,
menuIcon = getId('menu-icon'),
menuMain = getId('menu-main'),
classMenu = 'menu-active',
classHeader = 'active';
// Scroll
window.addEventListener("scroll", scrollOn);
function scrollOn() {
animatedScroll(headerScroll, classHeader, scrollHeight);
}
// Responsive menu
menuIcon.onclick = function() {
toggle(menuMain, classMenu);
}
menuMain.onclick = function() {
toggle(menuMain, classMenu);
}
// Moving the element after scrolling
function animatedScroll(element, classN, height) {
y = pageYOffset;
if (y > height) {
element.className = classN;
} else {
element.className = '';
}
}
// Change the element's class
function toggle(element, classe) {
element.className = element.className ? '' : classe;
}
// Return the element
function getId(id) {
return document.getElementById(id);
}
////////// Sticky navbar and hamburger icon
// Feature Test
if ('querySelector' in document && 'addEventListener' in window && Array.prototype.forEach) {
// Function to animate the scroll
var smoothScroll = function(anchor, duration) {
// Calculate how far and how fast to scroll
var startLocation = window.pageYOffset;
var endLocation = anchor.offsetTop;
var distance = endLocation - startLocation;
var increments = distance / (duration / 16);
var stopAnimation;
// Scroll the page by an increment, and check if it's time to stop
var animateScroll = function() {
window.scrollBy(0, increments);
stopAnimation();
};
// If scrolling down
if (increments >= 0) {
// Stop animation when you reach the anchor OR the bottom of the page
stopAnimation = function() {
var travelled = window.pageYOffset;
if ((travelled >= (endLocation - increments)) || ((window.innerHeight + travelled) >= document.body.offsetHeight)) {
clearInterval(runAnimation);
}
};
}
// If scrolling up
else {
// Stop animation when you reach the anchor OR the top of the page
stopAnimation = function() {
var travelled = window.pageYOffset;
if (travelled <= (endLocation || 0)) {
clearInterval(runAnimation);
}
};
}
// Loop the animation function
var runAnimation = setInterval(animateScroll, 16);
};
// Define smooth scroll links
var scrollToggle = document.querySelectorAll('.scroll');
// For each smooth scroll link
[].forEach.call(scrollToggle, function(toggle) {
// When the smooth scroll link is clicked
toggle.addEventListener('click', function(e) {
// Prevent the default link behavior
e.preventDefault();
// Get anchor link and calculate distance from the top
var dataID = toggle.getAttribute('href');
var dataTarget = document.querySelector(dataID);
var dataSpeed = toggle.getAttribute('data-speed');
// If the anchor exists
if (dataTarget) {
// Scroll to the anchor
smoothScroll(dataTarget, dataSpeed || 500);
}
}, false);
});
}
})();
这是JSFiddle。
如果是touchstart / onclick问题，为什么刷新后它会起作用？我应该删除IFFE吗？我应该在页面末尾添加脚本标记吗？
这里似乎有什么问题？
答案 0 :(得分：0)
显然标题中的行是一个问题。我删除了“异步”，导航菜单开始工作。
Reduce更改为：
<script type="text/javascript" src="script.js" async defer></script>